/*
 * Copyright (C) 2021 The Android Open Source Project
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package com.android.tools.idea.logcat.filters.parser

import com.android.tools.idea.logcat.filters.parser.LogcatFilterTypes.KVALUE
import com.android.tools.idea.logcat.filters.parser.LogcatFilterTypes.REGEX_KVALUE
import com.android.tools.idea.logcat.filters.parser.LogcatFilterTypes.STRING_KVALUE
import com.android.tools.idea.logcat.filters.parser.LogcatFilterTypes.VALUE
import com.intellij.psi.PsiElement
import com.intellij.psi.util.elementType

private val ESCAPED_CHAR_REGEX = """\\([ :'"\\])""".toRegex()

/** Extension functions for [PsiElement] classes. */
internal fun PsiElement.toText(): String {
  return when (elementType) {
    VALUE,
    KVALUE,
    STRING_KVALUE,
    REGEX_KVALUE -> {
      when {
        text.isSurroundedBy('\'') -> text.substring(1, textLength - 1).replace("\\'", "'")
        text.isSurroundedBy('"') -> text.substring(1, textLength - 1).replace("\\\"", "\"")
        else -> text.replace(ESCAPED_CHAR_REGEX) { it.groupValues[1] }
      }
    }
    else -> {
      text
    }
  }
}

internal fun PsiElement.isTopLevelValue() = firstChild.elementType == VALUE

private fun String.isSurroundedBy(char: Char) = length >= 2 && first() == char && first() == last()
